Johnston Island 760/011 RLR(1975) is 9.9m below BMNo21 1964
Documentation added 2011-11-24
Using information from the NOAA website the RLR diagram has been revised. Primary benchmark is now NO 13 1955 2.85m above gauge datum this appeared as a secondary benchmark on the original diagram. Previous Primary benchmark NO 21 1964 remains in the NOAA reports.
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